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Section 5: Interface Specifications
Page 5-6 GT Series Operator’s Manual
5.7 READY/BUSY
Ready / Busy is the hardware flow control method for the serial interface on the printer. Data
received cannot be guaranteed, when print data (ESC+"A"~ESC+"Z") is sent from the host,
under the following conditions:
1) When the printer is Offline
2) When an error has occurred in the printer
Pin Assignments
Interface Signals
1) DB-25 P 2) DB-9P
Printer Host Printer Host
FG 1
1 FG
FG 1
SD 2
3 RD
SD 2
2 RD
RD 3
2 SD
RD 3
3 SD
RS 4
5 CS
RS 4
8 CS
CS 5
4 RS
CS 5
7 RS
DR 6
20 ER
DR 6
4 ER
SG 7
7 SG
SG 7
5 SG
ER 20
6 DR
ER 20
6 DR
When using Windows Hardware Control:
3) DB-25 P 4) DB-9P
Printer Host Printer Host
FG 1
1 FG
FG 1
SD 2
3 RD
SD 2
2 RD
RD 3
2 SD
RD 3
3 SD
CS 5
20 ER
CS 4
6 DR
RS 4
6 DR
RS 5
4 ER
DR 6
4 RS
DR 6
7 RS
SG 7
7 SG
SG 7
5 SG
ER 20
5 CG
ER 20
6 CS
Pin no. Signal Type Direction Contents
1 FG - Frame Ground
2 SD Output Send Data
3 RD Input Receive Data
4 RS Output Request to Send
5 CS Input Clear to Send
6 DR Input Data Set Ready
7 SG - Signal Ground
20 ER Output Error